Authorities responded to the shooting in the 4900 block of Rivergrade Road at about 2 p.m.
Authorities responded to the shooting in the 4900 block of Rivergrade Road at about 2 p.m.
Three people were declared dead at the scene, including the gunman, and two other people were rushed to local hospitals.
Authorities evacuated the employees in the building. Dozens of people were seen streaming out of the building with their hands raised.
Olive Middle School Walnut Elementary School in the Baldwin Park Unified School District was put on lockdown, but the lockdowns have since been lifted.
